US8205711B2 - Seismic source arrays - Google Patents
Seismic source arrays Download PDFInfo
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- US8205711B2 US8205711B2 US10/239,443 US23944303A US8205711B2 US 8205711 B2 US8205711 B2 US 8205711B2 US 23944303 A US23944303 A US 23944303A US 8205711 B2 US8205711 B2 US 8205711B2
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- 238000003491 array Methods 0.000 title description 13
- 238000000034 method Methods 0.000 claims description 21
- 238000010304 firing Methods 0.000 claims description 7
- 230000001934 delay Effects 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 description 20
- 238000010586 diagram Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/003—Seismic data acquisition in general, e.g. survey design
- G01V1/006—Seismic data acquisition in general, e.g. survey design generating single signals by using more than one generator, e.g. beam steering or focusing arrays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3861—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas control of source arrays, e.g. for far field control
Definitions
- the invention relates to seismic source arrays.
- Seismic data are usually acquired using arrays of seismic sources.
- individual seismic sources are arranged in a certain spatial pattern.
- the most common marine seismic sources are airguns but also vibrators, waterguns and steam-injection guns are in use.
- the most common land seismic sources are vibrators and dynamite charges.
- Seismic source arrays are usually made up of one type of source. The sizes and strengths of the individual sources within the array may be different. In addition, the individual sources can be made to fire or start emitting at the same time or with small time delays between them.
- FIG. 1 A typical configuration is shown in which a vessel 2 tows an airgun source array 4 .
- a vibrator is mounted on a truck; a dynamite charge is placed in a drilled hole.
- An individual source has three spatial positions: in-line, cross-line and depth.
- the cross-line separation of the airguns is 8 m
- the in-line separation is 3 m
- their depth is 6 m.
- the design of a source array amounts to the selection of the number of individual sources, their strengths, their signatures, their positions (in-line, cross-line and depth) and their firing/emission delays.
- the design criteria are based on the desired strength and frequency content at the geological) target depth and a desire to radiate energy principally downward.
- the emitted signal can vary with azimuth (angle) and take-off angle.
- azimuth and take-off angle The concepts of azimuth and take-off angle are explained in FIG. 2 , in which the vessel 2 and source array 4 are again shown. The present specification is only concerned with azimuth.
- FIG. 3 shows the directivity pattern of the source array in FIG. 1 .
- the directivity of the source array is clearly varying with azimuth.
- the directivity in azimuth decreases for lower frequencies as is shown at frequencies 60 Hz and 20 Hz.
- FIGS. 4 a, b and c show the seismic signal and its amplitude and phase spectrum emitted at a take-off angle of 30° and at a range of azimuths. The change in the signal shape, its amplitude spectrum and its phase spectrum is significant.
- azimuthal directivity is undesirable.
- Azimuthal directivity will have a detrimental effect: it results in a loss of resolution and a reduction of the signal-to-noise ratio.
- the sources are usually located at or near the sea-surface.
- the source array in FIG. 1 would be typical for both sea-surface and sea-floor acquisition.
- the source vessel which might be the same vessel that is towing the receiver cable in sea-surface acquisition, sails through the survey area and activates the source at regular intervals.
- a single cable (called a streamer) is towed behind the vessel, while in 3D acquisition, an array of parallel streamers, normally equally spaced apart, is towed behind the vessel.
- the receiver cables 6 In 3D sea-floor acquisition, the receiver cables 6 (see FIG. 5 ) are laid out in an area over which the source vessel 2 sails a 3D pattern. Thus, seismic data are recorded in all directions from the source 4 (see FIG. 5 ), that is for a full circle of azimuths: 0°-360°.
- the receiver cable 8 is usually towed behind the source vessel 2 ; a technique called end-on acquisition (see FIG. 6 ).
- the seismic data are recorded for a half-circle of azimuths ⁇ 90° to +90°.
- the streamer is longer (typically, 4 km to 8 km) than the cross-line offset of the outer streamers (typically, 200 m to (500 m)
- much of the data have an azimuth fairly close to 0°.
- receiver cables are towed both in-front-of and behind the source vessel; a technique called split-spread acquisition.
- the seismic data are recorded for an entire circle of azimuths although much of the data have an azimuth close to either 0°, for the receiver cable behind the source vessel, or 180°, for the receiver cable ahead of the source vessel.
- the source arrays that are used in sea-floor acquisition are the same as the ones used in sea-surface acquisition. These were originally designed for 2D towed-streamer acquisition in which data are only acquired straight behind the vessel at a single azimuth of 180°. The directivity in azimuth was therefore of no concern. As discussed, 3D sea-surface seismic data contain a fan of azimuths and 3D sea-floor seismic data contain all azimuths. The azimuthal directivity of the source array will therefore be present in the data.
- source arrays are usually formed by placing a number of land seismic vibrators in a spatial pattern.
- the acquisition geometry of a 3D land survey is similar to the sea-floor acquisition geometry as shown in FIG. 5 , but with the receiver cables at the earth's surface.
- 3D land seismic data are acquired for all azimuths and the azimuthal directivity of the source array is present in the seismic data.
- a tool 10 with receivers is located deep (e.g. 1 km) down a drilled well 12 below a rig 14 (see FIGS. 7 a and b ).
- the source 4 is located at the surface.
- Borehole seismic acquisition can be done either at sea or on land.
- the employed source arrays are usually smaller than in the previously mentioned types of seismic acquisition.
- a borehole seismic survey is usually called a Vertical Seismic Profile (VSP).
- VSP Vertical Seismic Profile
- An acquisition geometry of a 3D VSP in a vertical well at sea is shown in FIGS. 7 a and b . It can be seen that the seismic data are acquired for all azimuths and the azimuthal directivity of the source array 4 will be present in the data. To a lesser degree it can also be present in a 2D VSP.
- phase control is achieved by symmetrically arranging identical source elements about the array's geometric centroid.
- the geometric centroid is the centre line in the source array about which the identical source elements are symmetrically arranged. This is the line where phase control is achieved. If all elements are equal, phase control is achieved in all azimuths for a range of take-off angles limited by geometry. However, phase control is only achieved within a limited range of take-off angles, and although the beam pattern is identical within the limited range of take-off angles where phase control is achieved, the beam pattern is not identical outside this limit.
- the invention seeks to provide a seismic source array which is azimuth-invariant, in the sense that it emits a seismic wavefield whose change over a selected range azimuths is zero or negligible. Such a source array can then be used in multi-azimuth seismic acquisition.
- the design of the source array involves the selection of the number of individual sources, their strengths, their signatures, their positions and their firing/emission delays such that the emitted seismic wavefield does not change or changes unperceivably over a selected range of azimuths.
- the design preferably fulfills geophysical criteria such as desired frequency content and signal strength in the downward direction of the geological target, and operational criteria such as deployability.
- the seismic source array of the invention can be used for many applications, including the following:
- 3D and 2D marine sea-surface acquisition including:
- all of the seismic source elements do not necessarily have to be positioned at the same depth. Where the seismic sources are arranged in a number of concentric circles, this can be achieved by putting the circles at different depths. Concentric circles of sources may also be placed directly above or below each other. Where the sources are arranged in concentric circles, each circle preferably contains identical source elements.
- array elements may be necessary to use array elements with different spectral output. It may also be necessary to assign different firing/emission delays to the array elements, particularly if elements are placed at different depths.
- the invention is not limited to the specific embodiments described hereinafter.
- the invention recognises that perturbations to the symmetry of the geometry of the elements and/or perturbations to the symmetry of the output of the elements can also give all azimuth-invariant source array, provided the perturbations are small.
- FIG. 1 shows a prior art airgun source array comprising three sub-arrays each comprising five airguns
- FIG. 2 illustrates the azimuth and take-off angles in a marine source array
- FIG. 3 shows energy directivity diagrams at 20 Hz, 60 Hz, 90 Hz and 130 Hz for the source array of FIG. 1 , in which each circle represents a different take-off angle;
- FIGS. 4 a, b and c show seismic signatures, amplitude spectra and phase spectra respectively at a take-off angle of 30° for a range of azimuths (0°, 45°, 90°, 135°, 180°) for the source array in FIG. 1 ;
- FIG. 5 is a schematic illustration of sea-floor acquisition, in which a vessel tows a source array over receiver cables spread out on the sea floor;
- FIG. 6 is a schematic illustration of towed-streamer sea-surface acquisition, in which a vessel tows both a source array and receiver cables close to the sea surface;
- FIG. 7 a is a schematic illustration of marine borehole seismic acquisition, in which a vessel tows a source array in the survey area around a rig;
- FIG. 7 b is a schematic illustration of the rig of FIG. 7 a , in which a tool with receivers is suspended from the rig down a well;
- FIG. 8 shows a source geometry according to the invention, using fixed azimuth sampling
- FIG. 9 shows four energy directivity diagrams at 20, 60, 90 and 130 Hz for the source geometry of FIG. 8 ;
- FIGS. 10 a, b and c show respectively seismic signatures amplitude spectra and phase spectra for FIG. 8 , and illustrate that the seismic signal is substantially the same at all of the displayed azimuths;
- FIG. 11 shows a source geometry in accordance with the invention, using hexagonal sampling
- FIG. 12 shows four energy directivity diagrams at 20, 60, 90 and 130 Hz for the source geometry of FIG. 11 ;
- FIGS. 13 a, b , and c show respectively seismic signatures, amplitude spectra and phase spectra for the source array of FIG. 11 , and show that the seismic signal is the same at all of the displayed azimuths up to 180 Hz;
- FIG. 14 shows four energy directivity diagrams at 20, 60, 90 and 130 Hz for a source geometry based on FIG. 11 , but using only three sub-arrays;
- FIGS. 15 a, b and c show seismic signatures amplitude spectra and phase spectra for the geometry used for FIG. 14 , and show that the seismic signal is the same at all of the displayed azimuths up to 180 Hz;
- FIG. 16 shows a source geometry according to the invention, with equal spatial sampling in-line and cross-line;
- FIG. 17 shows four energy directivity diagrams at 20, 60, 90 and 130 Hz for the source geometry of FIG. 16 ;
- FIGS. 18 a, b and c show seismic signatures, amplitude spectra and phase spectra for the source array of FIG. 16 , and show that the seismic signal is the same at all of the displayed azimuths up to 160 Hz;
- FIG. 19 shows a source geometry according to the invention using six vibrator trucks distributed uniformly on a circle.
- FIGS. 1 to 7 have already been described above in relation to the background to the invention.
- FIG. 8 shows an example of an azimuth-invariant source geometry for a source array 15 .
- the vessel direction is indicated by arrow 16 .
- Eight sources 18 of type 1 are spaced equally on an outer circle labelled “a”
- eight sources 20 of type 2 are spaced equally around an inner circle labelled “b”
- a single source 22 of type 3 is located at the centre of the array 15 .
- the geometry of the array is the result of a design procedure consisting of the following steps:
- This embodiment is particularly suited for marine acquisition since imaginary parallel lines 24 in FIG. 8 can be defined as subarrays, which makes the array 15 easy to tow.
- the number of elements per subarray is maximised by Step 6.
- the design procedure could be more general by omitting this step.
- the array 15 has rotational symmetry about the centre of the array.
- the example in FIG. 8 has 7 subarrays with a total of 17 guns 26 distributed over three types of source elements.
- the beam pattern of an array with this geometry is shown in FIG. 9 .
- the radius of the outer circle (a) is here 6 m and element type 1 is Bolt 1900LLX 54 in 3 airgun, element type 2 is Bolt 1900LLX 3 ⁇ 54 in 3 airgun cluster, and element type 3 is Bolt 1500LL 3 ⁇ 235 in 3 airgun cluster.
- FIGS. 10 a, b and c show respectively the seismic signal, its amplitude spectrum and phase spectrum emitted at a takeoff angle of 30° and at a range of azimuths. It can be seen that the seismic signal is the same for all the azimuths.
- FIG. 11 shows a further array 28 formed from 19 elements 30 of three types.
- the array elements 30 For arrays with a large aperture it might not be desirable to sample each radius by the same angular step size, which was the case for the embodiment of FIG. 8 .
- By placing the array elements 30 on a hexagonal grid, as shown in FIG. 11 one obtains an array configuration that samples a large radius denser than a small radius.
- the unique geometry is defined within a sector of 60°.
- the array elements line up (see imaginary parallel lines 32 ), which makes the array easy to tow in marine acquisition.
- Element type 1 is Bolt 1900LLX 2 ⁇ 54 in 3 airgun cluster
- element type 2 is Bolt 1900LLX 54 in 3 airgun
- element type 3 is Bolt 1900LLX 30 in 3 airgun.
- the resulting beam pattern is azimuth-invariant in the seismic frequency range.
- FIGS. 13 a, b and c show respectively the seismic signal, its amplitude and phase spectrum emitted at a take-off angle of 30° and at a range of azimuths. It can be seen that the seismic signal is the same for all the azimuths for frequencies up to 180 Hz.
- a source array consists of three subarrays.
- the geometry in FIG. 11 with the 12 outer elements of type 1 removed, only needs three subarrays (7 elements in total) and is therefore a particularly practical embodiment.
- Element type 2 is now Bolt 1500LL 3 ⁇ 235 in 3 airgun cluster and element type 3 is now Bolt 1900LLX 3 ⁇ 125 in 3 airgun cluster.
- the farfield beam pattern of a realisation of such a 7 element array is given in FIG. 14 , where the sides in each of the hexagons are 3.5 m.
- the resulting beam pattern is azimuth-invariant for frequencies up to 130 Hz and for take-off angles up to 60°.
- FIGS. 15 a, b and c show the seismic signal, its amplitude and phase spectrum emitted at a take-off angle of 30° and at a range of azimuths for such a 7 element array. It can be seen that the seismic signal is the same for all the azimuths for frequencies up to 180 Hz.
- FIG. 16 shows a perturbation of an azimuth-invariant geometry that still renders an azimuth-invariant source within the definition of the invention.
- An array 34 comprises 13 elements (guns) 36 of four different types. The number of guns in the array equals the number of grid nodes inside the circle of the outermost elements. The unique geometry is defined by an octant of the circular disk, such that the other positions are given by symmetry.
- FIGS. 8 and 11 are different in the way they approximate a circular disk.
- the disk was sampled regularly in azimuth and irregularly in the radial direction.
- the hexagonal geometry of FIG. 11 the disk was sampled irregularly both in azimuth and in the radial direction.
- the geometry of FIG. 16 also samples the disk irregularly both in azimuth and in the radial direction.
- Element type 1 is Bolt 1500LL 195 in 3 airgun
- element type 2 is Bolt 1500LL 2 ⁇ 1 55 in 3 airgun cluster
- element type 3 is Bolt 1500LL 3 ⁇ 235 in 3 airgun cluster
- element type 4 is Bolt 1900LLX 125 in 3 airgun.
- This beam pattern is azimuth-invariant for all take-off angles up to 100 Hz.
- FIGS. 18 a, b and c show respectively the seismic signal, its amplitude and phase spectrum emitted at a take-off angle of 30° and at a range of azimuths. It can be seen that the seismic signal is the same for all the azimuths for frequencies up to 160 Hz.
- the hexagonal embodiment of FIG. 11 can be applied for vibrator arrays in land seismic acquisition.
- a number of vibrators 38 in this case six, are distributed uniformly on a circle 39 as shown in FIG. 19 .
- the lower bound for the radius of the circle is determined by the outer dimensions of the vibrator trucks 40 .
- the outer dimensions of the trucks 40 are width 3 m by length 10 m.
- the radius of the circle is 7 m.
- a seismic source On land, a seismic source generates elastic waves with different propagation velocities. These propagation velocities can be very different from one survey location to another.
- the farfield beam pattern is therefore not expressed in terms of azimuth and take-off angle but in terms of azimuth and apparent velocity.
- v app v sin ⁇ ⁇ ⁇ where ⁇ is the propagation velocity and ⁇ is the take-off angle.
- useful reflection data can have apparent velocities from ⁇ down to about 1500 m/s.
- Strong coherent noise known as groundroll, is commonly present.
- Groundroll travels along the earth's surface so it has a take-off angle of ⁇ 90°. Its propagation velocity is low: usually between 1000 m/s and 100 m/s. Groundroll is low frequent; its bandwidth does usually not extend beyond 40 Hz.
- the farfield beam pattern of the array in FIG. 19 is given in FIG. 20 .
- All vibrators 38 generate the same 6-90 Hz sweep.
- the circles in the diagram show the change in azimuth for a fixed apparent velocity. It can be seen that for reflection data, with apparent velocities that are higher than 1500 m/s, the source array is azimuth-invariant down to 200 m/s at 20 Hz. At 40 Hz, the source array is azimuth-invariant for groundroll down to 500 m/s.
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Abstract
Description
- (a) Sea-surface acquisition, in which a vessel tows one or more cables with built-in receivers. The receiver cables are usually towed at a depth between 3 m and 12 m. This is the most common type of acquisition and is usually referred to as towed-streamer acquisition.
- (b) Sea-floor acquisition, in which the receivers are planted at the sea floor or built into a receiver cable, which is laid at the sea floor. This type of acquisition is a relatively recent development.
-
- wide-tow streamer acquisition;
- end-on and split-spread acquisition;
3. 3D and 2D land seismic acquisition; and
4. borehole seismic acquisition, both marine and land including: - 2D and 3D walkaway VSP;
- offset VSP.
- 1. Select the radius of the outer circle. The outer dimension of the array generally determines the width of spatial mainlobe.
- 2. Select the angular sampling interval, Δθ=360°/N, where N is the number of elements on each circle. E.g. in
FIG. 8 , Δθ=45°. A dense angular sampling will give small variations with azimuth angle. - 3. Distribute equal elements regularly over the circle at the same depth.
- 4. Draw lines through each element parallel to a fixed direction.
- 5. Determine the number of different source element types, which is less than or equal to the number of different circles. Different source elements may be necessary in order to fulfil spectral constraints on the composite wavefield and/or constraints on the composite signatures.
- 6. The relationship between the M circles is defined such that for every circle m=1: M−1 do:
- (a) The next circle, #m+1, is defined such that the line next to the outermost line of the current circle, #m, is the tangent of the next circle (#m+1). E.g.,
line # 2 inFIG. 8 is a tangent to circle b and is the line immediately next to the outermost line of circle a. - (b) Distribute the N elements over circle #m+1 such that one of the elements is placed on the line of circle #m. E.g., one of the elements of circle b is placed on
line # 2 inFIG. 8 . - (c) Draw lines through each element parallel to the lines in
Step 4.
- (a) The next circle, #m+1, is defined such that the line next to the outermost line of the current circle, #m, is the tangent of the next circle (#m+1). E.g.,
- 7. An element of the last element type is placed at the centre.
where ν is the propagation velocity and φ is the take-off angle.
Claims (37)
Applications Claiming Priority (2)
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GB0007034.2 | 2000-03-23 | ||
GBGB0007034.2A GB0007034D0 (en) | 2000-03-23 | 2000-03-23 | Seismic source arrays |
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US20030168277A1 US20030168277A1 (en) | 2003-09-11 |
US8205711B2 true US8205711B2 (en) | 2012-06-26 |
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US10/239,443 Expired - Lifetime US8205711B2 (en) | 2000-03-23 | 2001-03-09 | Seismic source arrays |
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US (1) | US8205711B2 (en) |
AU (1) | AU775689B2 (en) |
BR (1) | BR0109763A (en) |
CA (1) | CA2402843A1 (en) |
GB (2) | GB0007034D0 (en) |
NO (1) | NO335028B1 (en) |
WO (1) | WO2001071385A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
NO20024562L (en) | 2002-09-23 |
AU775689B2 (en) | 2004-08-12 |
WO2001071385A1 (en) | 2001-09-27 |
AU3767501A (en) | 2001-10-03 |
GB0007034D0 (en) | 2000-05-10 |
NO20024562D0 (en) | 2002-09-23 |
GB2376528A (en) | 2002-12-18 |
NO335028B1 (en) | 2014-08-25 |
GB2376528B (en) | 2004-03-03 |
GB0222915D0 (en) | 2002-11-13 |
BR0109763A (en) | 2003-04-29 |
CA2402843A1 (en) | 2001-09-27 |
US20030168277A1 (en) | 2003-09-11 |
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